84. Anyone who is interested in reading those documents

can learn to read (and to write) cursive as an adult. It's not difficult to do and the workbooks are inexpensive and easy to get. Some of the books have even been made specifically for adults.

Also, some parents will teach their children to do it at home, even if it isn't taught in school. It's never going to become a completely lost art. There will always be some people around who can read and write cursive.